Junior high school mathematics is surface treatment device for teaching aid

The utility model discloses a junior high school mathematics is surface treatment device for teaching aid, the on -line screen storage device comprises a base, upper end one side fixedly connected with support column of base, the upper end fixedly connected with of support column places the board, the one side of placing the board is equipped with the standing groove, the standing groove internalrotation is connected with spiral shell rasp bar, and spiral shell rasp bar's both ends rotate the connection respectively on the relative inner wall of standing groove, place one side fixedly connected with servo motor of board, servo motor's output shaft end run through the standing groove the lateral wall and with spiral shell rasp bar's one end fixed connection, the screw has cup jointed and has moved the cover on spiral shell rasp bar's the lateral wall, the one end that removes the cover runs through standing groove and fixedly connected with connecting plate. The utility model disclosescompact structure, conven